﻿/* ===================================================
 *  jquery-sortable.js v0.9.12
 *  http://johnny.github.com/jquery-sortable/
 * ===================================================
 *  Copyright (c) 2012 Jonas von Andrian
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
 *  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ========================================================== */


!function ($, window, pluginName, undefined) {
    var eventNames,
    containerDefaults = {
        // If true, items can be dragged from this container
        drag: true,
        // If true, items can be droped onto this container
        drop: true,
        // Exclude items from being draggable, if the
        // selector matches the item
        exclude: "",
        // If true, search for nested containers within an item
        nested: true,
        // If true, the items are assumed to be arranged vertically
        vertical: true
    }, // end container defaults
    groupDefaults = {
        // This is executed after the placeholder has been moved.
        // $closestItemOrContainer contains the closest item, the placeholder
        // has been put at or the closest empty Container, the placeholder has
        // been appended to.
        afterMove: function ($placeholder, container, $closestItemOrContainer) {
        },
        // The exact css path between the container and its items, e.g. "> tbody"
        containerPath: "",
        // The css selector of the containers
        containerSelector: "ol, ul",
        // Distance the mouse has to travel to start dragging
        distance: 0,
        // Time in milliseconds after mousedown until dragging should start.
        // This option can be used to prevent unwanted drags when clicking on an element.
        delay: 0,
        // The css selector of the drag handle
        handle: "",
        // The exact css path between the item and its subcontainers
        itemPath: "",
        // The css selector of the items
        itemSelector: "li",
        // Check if the dragged item may be inside the container.
        // Use with care, since the search for a valid container entails a depth first search
        // and may be quite expensive.
        isValidTarget: function ($item, container) {
            return true
        },
        // Executed before onDrop if placeholder is detached.
        // This happens if pullPlaceholder is set to false and the drop occurs outside a container.
        onCancel: function ($item, container, _super, event) {
        },
        // Executed at the beginning of a mouse move event.
        // The Placeholder has not been moved yet.
        onDrag: function ($item, position, _super, event) {
            $item.css(position)
        },
        // Called after the drag has been started,
        // that is the mouse button is beeing held down and
        // the mouse is moving.
        // The container is the closest initialized container.
        // Therefore it might not be the container, that actually contains the item.
        onDragStart: function ($item, container, _super, event) {
            $item.css({
                height: $item.height(),
                width: $item.width()
            })
            $item.addClass("dragged")
            $("body").addClass("dragging")
        },
        // Called when the mouse button is beeing released
        onDrop: function ($item, container, _super, event) {
            $item.removeClass("dragged").removeAttr("style")
            $("body").removeClass("dragging")
        },
        // Called on mousedown. If falsy value is returned, the dragging will not start.
        // If clicked on input element, ignore
        onMousedown: function ($item, _super, event) {
            if (!event.target.nodeName.match(/^(input|select)$/i)) {
                event.preventDefault()
                return true
            }
        },
        // Template for the placeholder. Can be any valid jQuery input
        // e.g. a string, a DOM element.
        // The placeholder must have the class "placeholder"
        placeholder: '<li class="placeholder"/>',
        // If true, the position of the placeholder is calculated on every mousemove.
        // If false, it is only calculated when the mouse is above a container.
        pullPlaceholder: true,
        // Specifies serialization of the container group.
        // The pair $parent/$children is either container/items or item/subcontainers.
        serialize: function ($parent, $children, parentIsContainer) {
            var result = $.extend({}, $parent.data())

            if (parentIsContainer)
                return [$children]
            else if ($children[0]) {
                result.children = $children
            }

            delete result.subContainers
            delete result.sortable

            return result
        },
        // Set tolerance while dragging. Positive values decrease sensitivity,
        // negative values increase it.
        tolerance: 0
    }, // end group defaults
    containerGroups = {},
    groupCounter = 0,
    emptyBox = {
        left: 0,
        top: 0,
        bottom: 0,
        right: 0
    },
    eventNames = {
        start: "touchstart.sortable mousedown.sortable",
        drop: "touchend.sortable touchcancel.sortable mouseup.sortable",
        drag: "touchmove.sortable mousemove.sortable",
        scroll: "scroll.sortable"
    },
    subContainerKey = "subContainers"

    /*
     * a is Array [left, right, top, bottom]
     * b is array [left, top]
     */
    function d(a, b) {
        var x = Math.max(0, a[0] - b[0], b[0] - a[1]),
        y = Math.max(0, a[2] - b[1], b[1] - a[3])
        return x + y;
    }

    function setDimensions(array, dimensions, tolerance, useOffset) {
        var i = array.length,
        offsetMethod = useOffset ? "offset" : "position"
        tolerance = tolerance || 0

        while (i--) {
            var el = array[i].el ? array[i].el : $(array[i]),
            // use fitting method
            pos = el[offsetMethod]()
            pos.left += parseInt(el.css('margin-left'), 10)
            pos.top += parseInt(el.css('margin-top'), 10)
            dimensions[i] = [
              pos.left - tolerance,
              pos.left + el.outerWidth() + tolerance,
              pos.top - tolerance,
              pos.top + el.outerHeight() + tolerance
            ]
        }
    }

    function getRelativePosition(pointer, element) {
        var offset = element.offset()
        return {
            left: pointer.left - offset.left,
            top: pointer.top - offset.top
        }
    }

    function sortByDistanceDesc(dimensions, pointer, lastPointer) {
        pointer = [pointer.left, pointer.top]
        lastPointer = lastPointer && [lastPointer.left, lastPointer.top]

        var dim,
        i = dimensions.length,
        distances = []

        while (i--) {
            dim = dimensions[i]
            distances[i] = [i, d(dim, pointer), lastPointer && d(dim, lastPointer)]
        }
        distances = distances.sort(function (a, b) {
            return b[1] - a[1] || b[2] - a[2] || b[0] - a[0]
        })

        // last entry is the closest
        return distances
    }

    function ContainerGroup(options) {
        this.options = $.extend({}, groupDefaults, options)
        this.containers = []

        if (!this.options.rootGroup) {
            this.scrollProxy = $.proxy(this.scroll, this)
            this.dragProxy = $.proxy(this.drag, this)
            this.dropProxy = $.proxy(this.drop, this)
            this.placeholder = $(this.options.placeholder)

            if (!options.isValidTarget)
                this.options.isValidTarget = undefined
        }
    }

    ContainerGroup.get = function (options) {
        if (!containerGroups[options.group]) {
            if (options.group === undefined)
                options.group = groupCounter++

            containerGroups[options.group] = new ContainerGroup(options)
        }

        return containerGroups[options.group]
    }

    ContainerGroup.prototype = {
        dragInit: function (e, itemContainer) {
            this.$document = $(itemContainer.el[0].ownerDocument)

            // get item to drag
            this.item = $(e.target).closest(this.options.itemSelector)
            this.itemContainer = itemContainer

            if (this.item.is(this.options.exclude) ||
               !this.options.onMousedown(this.item, groupDefaults.onMousedown, e)) {
                return
            }

            this.setPointer(e)
            this.toggleListeners('on')

            this.setupDelayTimer()
            this.dragInitDone = true
        },
        drag: function (e) {
            if (!this.dragging) {
                if (!this.distanceMet(e) || !this.delayMet)
                    return

                this.options.onDragStart(this.item, this.itemContainer, groupDefaults.onDragStart, e)
                this.item.before(this.placeholder)
                this.dragging = true
            }

            this.setPointer(e)
            // place item under the cursor
            this.options.onDrag(this.item,
                                getRelativePosition(this.pointer, this.item.offsetParent()),
                                groupDefaults.onDrag,
                                e)

            var x = e.pageX || e.originalEvent.pageX,
            y = e.pageY || e.originalEvent.pageY,
            box = this.sameResultBox,
            t = this.options.tolerance

            if (!box || box.top - t > y || box.bottom + t < y || box.left - t > x || box.right + t < x)
                if (!this.searchValidTarget())
                    this.placeholder.detach()
        },
        drop: function (e) {
            this.toggleListeners('off')

            this.dragInitDone = false

            if (this.dragging) {
                // processing Drop, check if placeholder is detached
                if (this.placeholder.closest("html")[0])
                    this.placeholder.before(this.item).detach()
                else
                    this.options.onCancel(this.item, this.itemContainer, groupDefaults.onCancel, e)

                this.options.onDrop(this.item, this.getContainer(this.item), groupDefaults.onDrop, e)

                // cleanup
                this.clearDimensions()
                this.clearOffsetParent()
                this.lastAppendedItem = this.sameResultBox = undefined
                this.dragging = false
            }
        },
        searchValidTarget: function (pointer, lastPointer) {
            if (!pointer) {
                pointer = this.relativePointer || this.pointer
                lastPointer = this.lastRelativePointer || this.lastPointer
            }

            var distances = sortByDistanceDesc(this.getContainerDimensions(),
                                               pointer,
                                               lastPointer),
            i = distances.length

            while (i--) {
                var index = distances[i][0],
                distance = distances[i][1]

                if (!distance || this.options.pullPlaceholder) {
                    var container = this.containers[index]
                    if (!container.disabled) {
                        if (!this.$getOffsetParent()) {
                            var offsetParent = container.getItemOffsetParent()
                            pointer = getRelativePosition(pointer, offsetParent)
                            lastPointer = getRelativePosition(lastPointer, offsetParent)
                        }
                        if (container.searchValidTarget(pointer, lastPointer))
                            return true
                    }
                }
            }
            if (this.sameResultBox)
                this.sameResultBox = undefined
        },
        movePlaceholder: function (container, item, method, sameResultBox) {
            var lastAppendedItem = this.lastAppendedItem
            if (!sameResultBox && lastAppendedItem && lastAppendedItem[0] === item[0])
                return;

            item[method](this.placeholder)
            this.lastAppendedItem = item
            this.sameResultBox = sameResultBox
            this.options.afterMove(this.placeholder, container, item)
        },
        getContainerDimensions: function () {
            if (!this.containerDimensions)
                setDimensions(this.containers, this.containerDimensions = [], this.options.tolerance, !this.$getOffsetParent())
            return this.containerDimensions
        },
        getContainer: function (element) {
            return element.closest(this.options.containerSelector).data(pluginName)
        },
        $getOffsetParent: function () {
            if (this.offsetParent === undefined) {
                var i = this.containers.length - 1,
                offsetParent = this.containers[i].getItemOffsetParent()

                if (!this.options.rootGroup) {
                    while (i--) {
                        if (offsetParent[0] != this.containers[i].getItemOffsetParent()[0]) {
                            // If every container has the same offset parent,
                            // use position() which is relative to this parent,
                            // otherwise use offset()
                            // compare #setDimensions
                            offsetParent = false
                            break;
                        }
                    }
                }

                this.offsetParent = offsetParent
            }
            return this.offsetParent
        },
        setPointer: function (e) {
            var pointer = this.getPointer(e)

            if (this.$getOffsetParent()) {
                var relativePointer = getRelativePosition(pointer, this.$getOffsetParent())
                this.lastRelativePointer = this.relativePointer
                this.relativePointer = relativePointer
            }

            this.lastPointer = this.pointer
            this.pointer = pointer
        },
        distanceMet: function (e) {
            var currentPointer = this.getPointer(e)
            return (Math.max(
              Math.abs(this.pointer.left - currentPointer.left),
              Math.abs(this.pointer.top - currentPointer.top)
            ) >= this.options.distance)
        },
        getPointer: function (e) {
            return {
                left: e.pageX || e.originalEvent.pageX,
                top: e.pageY || e.originalEvent.pageY
            }
        },
        setupDelayTimer: function () {
            var that = this
            this.delayMet = !this.options.delay

            // init delay timer if needed
            if (!this.delayMet) {
                clearTimeout(this._mouseDelayTimer);
                this._mouseDelayTimer = setTimeout(function () {
                    that.delayMet = true
                }, this.options.delay)
            }
        },
        scroll: function (e) {
            this.clearDimensions()
            this.clearOffsetParent() // TODO is this needed?
        },
        toggleListeners: function (method) {
            var that = this,
            events = ['drag', 'drop', 'scroll']

            $.each(events, function (i, event) {
                that.$document[method](eventNames[event], that[event + 'Proxy'])
            })
        },
        clearOffsetParent: function () {
            this.offsetParent = undefined
        },
        // Recursively clear container and item dimensions
        clearDimensions: function () {
            this.traverse(function (object) {
                object._clearDimensions()
            })
        },
        traverse: function (callback) {
            callback(this)
            var i = this.containers.length
            while (i--) {
                this.containers[i].traverse(callback)
            }
        },
        _clearDimensions: function () {
            this.containerDimensions = undefined
        },
        _destroy: function () {
            containerGroups[this.options.group] = undefined
        }
    }

    function Container(element, options) {
        this.el = element
        this.options = $.extend({}, containerDefaults, options)

        this.group = ContainerGroup.get(this.options)
        this.rootGroup = this.options.rootGroup || this.group
        this.handle = this.rootGroup.options.handle || this.rootGroup.options.itemSelector

        var itemPath = this.rootGroup.options.itemPath
        this.target = itemPath ? this.el.find(itemPath) : this.el

        this.target.on(eventNames.start, this.handle, $.proxy(this.dragInit, this))

        if (this.options.drop)
            this.group.containers.push(this)
    }

    Container.prototype = {
        dragInit: function (e) {
            var rootGroup = this.rootGroup

            if (!this.disabled &&
                !rootGroup.dragInitDone &&
                this.options.drag &&
                this.isValidDrag(e)) {
                rootGroup.dragInit(e, this)
            }
        },
        isValidDrag: function (e) {
            return e.which == 1 ||
              e.type == "touchstart" && e.originalEvent.touches.length == 1
        },
        searchValidTarget: function (pointer, lastPointer) {
            var distances = sortByDistanceDesc(this.getItemDimensions(),
                                               pointer,
                                               lastPointer),
            i = distances.length,
            rootGroup = this.rootGroup,
            validTarget = !rootGroup.options.isValidTarget ||
              rootGroup.options.isValidTarget(rootGroup.item, this)

            if (!i && validTarget) {
                rootGroup.movePlaceholder(this, this.target, "append")
                return true
            } else
                while (i--) {
                    var index = distances[i][0],
                    distance = distances[i][1]
                    if (!distance && this.hasChildGroup(index)) {
                        var found = this.getContainerGroup(index).searchValidTarget(pointer, lastPointer)
                        if (found)
                            return true
                    }
                    else if (validTarget) {
                        this.movePlaceholder(index, pointer)
                        return true
                    }
                }
        },
        movePlaceholder: function (index, pointer) {
            var item = $(this.items[index]),
            dim = this.itemDimensions[index],
            method = "after",
            width = item.outerWidth(),
            height = item.outerHeight(),
            offset = item.offset(),
            sameResultBox = {
                left: offset.left,
                right: offset.left + width,
                top: offset.top,
                bottom: offset.top + height
            }
            if (this.options.vertical) {
                var yCenter = (dim[2] + dim[3]) / 2,
                inUpperHalf = pointer.top <= yCenter
                if (inUpperHalf) {
                    method = "before"
                    sameResultBox.bottom -= height / 2
                } else
                    sameResultBox.top += height / 2
            } else {
                var xCenter = (dim[0] + dim[1]) / 2,
                inLeftHalf = pointer.left <= xCenter
                if (inLeftHalf) {
                    method = "before"
                    sameResultBox.right -= width / 2
                } else
                    sameResultBox.left += width / 2
            }
            if (this.hasChildGroup(index))
                sameResultBox = emptyBox
            this.rootGroup.movePlaceholder(this, item, method, sameResultBox)
        },
        getItemDimensions: function () {
            if (!this.itemDimensions) {
                this.items = this.$getChildren(this.el, "item").filter(":not(.placeholder, .dragged)").get()
                setDimensions(this.items, this.itemDimensions = [], this.options.tolerance)
            }
            return this.itemDimensions
        },
        getItemOffsetParent: function () {
            var offsetParent,
            el = this.el
            // Since el might be empty we have to check el itself and
            // can not do something like el.children().first().offsetParent()
            if (el.css("position") === "relative" || el.css("position") === "absolute" || el.css("position") === "fixed")
                offsetParent = el
            else
                offsetParent = el.offsetParent()
            return offsetParent
        },
        hasChildGroup: function (index) {
            return this.options.nested && this.getContainerGroup(index)
        },
        getContainerGroup: function (index) {
            var childGroup = $.data(this.items[index], subContainerKey)
            if (childGroup === undefined) {
                var childContainers = this.$getChildren(this.items[index], "container")
                childGroup = false

                if (childContainers[0]) {
                    var options = $.extend({}, this.options, {
                        rootGroup: this.rootGroup,
                        group: groupCounter++
                    })
                    childGroup = childContainers[pluginName](options).data(pluginName).group
                }
                $.data(this.items[index], subContainerKey, childGroup)
            }
            return childGroup
        },
        $getChildren: function (parent, type) {
            var options = this.rootGroup.options,
            path = options[type + "Path"],
            selector = options[type + "Selector"]

            parent = $(parent)
            if (path)
                parent = parent.find(path)

            return parent.children(selector)
        },
        _serialize: function (parent, isContainer) {
            var that = this,
            childType = isContainer ? "item" : "container",

            children = this.$getChildren(parent, childType).not(this.options.exclude).map(function () {
                return that._serialize($(this), !isContainer)
            }).get()

            return this.rootGroup.options.serialize(parent, children, isContainer)
        },
        traverse: function (callback) {
            $.each(this.items || [], function (item) {
                var group = $.data(this, subContainerKey)
                if (group)
                    group.traverse(callback)
            });

            callback(this)
        },
        _clearDimensions: function () {
            this.itemDimensions = undefined
        },
        _destroy: function () {
            var that = this;

            this.target.off(eventNames.start, this.handle);
            this.el.removeData(pluginName)

            if (this.options.drop)
                this.group.containers = $.grep(this.group.containers, function (val) {
                    return val != that
                })

            $.each(this.items || [], function () {
                $.removeData(this, subContainerKey)
            })
        }
    }

    var API = {
        enable: function () {
            this.traverse(function (object) {
                object.disabled = false
            })
        },
        disable: function () {
            this.traverse(function (object) {
                object.disabled = true
            })
        },
        serialize: function () {
            return this._serialize(this.el, true)
        },
        refresh: function () {
            this.traverse(function (object) {
                object._clearDimensions()
            })
        },
        destroy: function () {
            this.traverse(function (object) {
                object._destroy();
            })
        }
    }

    $.extend(Container.prototype, API)

    /**
     * jQuery API
     *
     * Parameters are
     *   either options on init
     *   or a method name followed by arguments to pass to the method
     */
    $.fn[pluginName] = function (methodOrOptions) {
        var args = Array.prototype.slice.call(arguments, 1)

        return this.map(function () {
            var $t = $(this),
            object = $t.data(pluginName)

            if (object && API[methodOrOptions])
                return API[methodOrOptions].apply(object, args) || this
            else if (!object && (methodOrOptions === undefined ||
                                typeof methodOrOptions === "object"))
                $t.data(pluginName, new Container($t, methodOrOptions))

            return this
        });
    };

}(jQuery, window, 'sortable');
